docs: def validate_v3_endpoint_data(self, endpoints, admin_port, internal_port,
                                    public_port, expected, expected_num_eps=3):
          """Validate keystone v3 endpoint data.
  
          Validate the v3 endpoint data which has changed from v2.  The
          ports are used to find the matching endpoint.
  
          The new v3 endpoint data looks like:
  
          [<Endpoint enabled=True,
                     id=0432655fc2f74d1e9fa17bdaa6f6e60b,
                     interface=admin,
                     links={u'self': u'<RESTful URL of this endpoint>'},
                     region=RegionOne,
                     region_id=RegionOne,
                     service_id=17f842a0dc084b928e476fafe67e4095,
                     url=http://10.5.6.5:9312>,
           <Endpoint enabled=True,
                     id=6536cb6cb92f4f41bf22b079935c7707,
                     interface=admin,
                     links={u'self': u'<RESTful url of this endpoint>'},
                     region=RegionOne,
                     region_id=RegionOne,
                     service_id=72fc8736fb41435e8b3584205bb2cfa3,
                     url=http://10.5.6.6:35357/v3>,
                     ... ]
          """
          self.log.debug('Validating v3 endpoint data...')
          self.log.debug('actual: {}'.format(repr(endpoints)))
          found = []
          for ep in endpoints:
              self.log.debug('endpoint: {}'.format(repr(ep)))
              if ((admin_port in ep.url and ep.interface == 'admin') or
                      (internal_port in ep.url and ep.interface == 'internal') or
                      (public_port in ep.url and ep.interface == 'public')):
                  found.append(ep.interface)
                  # note we ignore the links member.
                  actual = {'id': ep.id,
                            'region': ep.region,
                            'region_id': ep.region_id,
                            'interface': self.not_null,
                            'url': ep.url,
                            'service_id': ep.service_id, }
                  ret = self._validate_dict_data(expected, actual)
                  if ret:
                      return 'unexpected endpoint data - {}'.format(ret)
  
          if len(found) != expected_num_eps:
              return 'Unexpected number of endpoints found'